<script lang="ts" setup name="SidebarItem">
import type { RouteRecordRaw } from 'vue-router'
import { isExternal } from '@/utils/validate'
import path from 'path-browserify'
import Link from './Link.vue'

interface Props {
  item: RouteRecordRaw
  basePath?: string
}

const props = withDefaults(defineProps<Props>(), {
  basePath: ''
})

/** 是否始终显示根菜单 */
const alwaysShowRootMenu = computed(() => props.item.meta?.alwaysShow)

/** 显示的子菜单 */
const showingChildren = computed(
  () => props.item.children?.filter((child) => !child.meta?.hidden) ?? []
)

/** 显示的子菜单数量 */
const showingChildNumber = computed(() => showingChildren.value.length)

/** 唯一的子菜单项 */
const theOnlyOneChild = computed(() => {
  const number = showingChildNumber.value
  switch (true) {
    case number > 1:
      return null
    case number === 1:
      return showingChildren.value[0]
    default:
      return { ...props.item, path: '' }
  }
})

/** 解析路径 */
function resolvePath(routePath: string) {
  switch (true) {
    case isExternal(routePath):
      return routePath
    case isExternal(props.basePath):
      return props.basePath
    default:
      return path.resolve(props.basePath, routePath)
  }
}
</script>

<template>
  <template
    v-if="!alwaysShowRootMenu && theOnlyOneChild && !theOnlyOneChild.children"
  >
    <Link
      v-if="theOnlyOneChild.meta"
      :to="resolvePath(theOnlyOneChild.path)"
    >
    <el-menu-item :index="resolvePath(theOnlyOneChild.path)">
      <SvgIcon
        v-if="theOnlyOneChild.meta.svgIcon"
        :name="theOnlyOneChild.meta.svgIcon"
        class="svg-icon"
      />
      <component
        v-else-if="theOnlyOneChild.meta.elIcon"
        :is="theOnlyOneChild.meta.elIcon"
        class="el-icon"
      />
      <template
        v-if="theOnlyOneChild.meta.title"
        #title
      >
        <span class="title">{{ theOnlyOneChild.meta.title }}</span>
      </template>
    </el-menu-item>
    </Link>
  </template>
  <el-sub-menu
    v-else
    :index="resolvePath(props.item.path)"
    teleported
  >
    <template #title>
      <SvgIcon
        v-if="props.item.meta?.svgIcon"
        :name="props.item.meta.svgIcon"
        class="svg-icon"
      />
      <component
        v-else-if="props.item.meta?.elIcon"
        :is="props.item.meta.elIcon"
        class="el-icon"
      />
      <span
        v-if="props.item.meta?.title"
        class="title"
      >{{ props.item.meta.title }}</span>
    </template>
    <template v-if="props.item.children">
      <Item
        v-for="child in showingChildren"
        :key="child.path"
        :item="child"
        :base-path="resolvePath(child.path)"
      />
    </template>
  </el-sub-menu>
</template>

<style lang="scss" scoped>
@import '@/assets/styles/mixins.scss';

.svg-icon {
  min-width: 1em;
  margin-right: 12px;
  font-size: 18px;
}

.el-icon {
  width: 1em !important;
  margin-right: 12px !important;
  font-size: 18px;
}

.title {
  @extend %ellipsis;
}
</style>
